[test] Removes kibana_dashboard_only_user role reference

[tylersmalley]

Caused by elastic/elasticsearch#76507

5c53a66e8f3f04ad9b7c9cf5ae768d0adef4c91b is the first bad commit
commit 5c53a66e8f3f04ad9b7c9cf5ae768d0adef4c91b
Author: Devon Thomson <[email protected]>
Date:   Mon Aug 16 10:15:50 2021 -0400

    remove dashboard only reserved role (#76507)
    
    Removes the deprecated kibana_dashboard_only_user from the set of reserved roles in Elasticsearch as this legacy functionality is being removed from Kibana.
    
    Relates: elastic/kibana#54755.

 .../documentation/SecurityDocumentationIT.java     |  4 +--
 .../security/authz/store/ReservedRolesStore.java   | 10 ------
 .../authz/store/ReservedRolesStoreTests.java       | 39 ----------------------
 3 files changed, 2 insertions(+), 51 deletions(-)

[tylersmalley]

cc @ThomThomson, hoping this is all needed to get the tests passing.

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: e59ff16
• Storybooks Preview

Metrics [docs]

✅ unchanged

History

• 💔 Build #146213 failed 8f9c862453a4631432a2599156c9377a0340842b
• 💔 Build #146190 failed 7e9cd5ec020947e50b3bd0ef274413cfefd49f1a
• 💔 Build #145951 failed de60ad0

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@elasticmachine merge upstream

[jportner]

@ThomThomson do you still need a review on this? it looks like you already included some of the changes in #108103

[ThomThomson]

I suppose it depends on how urgent it is to fix this failure. #108103 should also fix everything, but it will take a little longer for the reviews. Hopefully I can get the other PR reviewed and in by end of this week and we can close this one.

[tylersmalley]

#108103 has been merged. Thanks @ThomThomson